The term 'Cartoon Maker's Frame' can be summarized as a three-letter acronym, CEL. This acronym stands for 'CEL Animation, ' which is a type of animation used in the production of cartoons. CEL Animation involves drawing individual frames on transparent sheets of celluloid, which are then photographed and combined to create the illusion of movement. This technique was widely used in the early days of animation, and is still used today in some forms of animation.